Door locking device



Jan. 17, 1939. J. MORA 2,144,075

DOOR LOCKING DEVICE Filed March 19, 1938 INVENTOR JOSe Mom /e44. aim;

ATTORNEY Patented Jan. 17, 1939 UNITED STATES PATENT OFFICE DOOR-LOCKING DEVICE Jose Mora, New York, N. Y.

Application March 19, 1938, Serial No. 196,829

2 Claims.

The invention relates to a door locking device and more particularly toa jimmy-proof interlocking door lock device.

Among the objects are to provide a device of extreme simplicity and oneof excellent appearance. Due to its simplicity the device readily lendsitself to economics of manufacture and ease of installation.

The invention contemplates a pair of comparatively long rigidinterlocking plates, one attached to the door and having a standard lockset therein and the other attached to the door jamb and having thekeeper suitably cooperating therewith. A device is thus provided Whichwill effectually frustrate the attempts of any unauthorized persontrying to force the door with a jimmy or other tool.

Other advantages and objects will become apparent as the specificationproceeds. Referring to the drawing forming a part thereof and in which apreferred embodiment is illustrated:

Fig. 1 is an outside elevational view of a door showing the interlockingplates and lock attached thereto;

Figs. 2 and 3 are cross-sectional views on a larger scale and taken onlines 2-2 and 33 respectively of Fig. 1;

Fig. 4 is an edge view of the door jamb showing one of the interlockingplates and the keeper; and

Fig. 5 is a face View of the interlocking plate which is secured to thedoor.

Referring again to said drawing the reference numeral ill designates thedoor and l I the door jamb or frame. The door jamb has the customarystrip l2 which may or may not be part of the door jamb or frame.

A substantially long narrow plate l3 of rigid construction is secured tothe outside of the door I E! preferably by four bolts I4. The bolts l4have round heads and square shoulders, the square shoulders cooperatingwith square holes IS in the plate. The bolts 14 are provided with nutsit on the inner side of the door to securely hold the plate in position.It will be apparent with this construction it will be impossible toremove the plate It from the outside of the door.

At approximately its central portion, lengthwise, the plate has anopening 20 which accommodates the cylinder 2! of a conventional lock 22,having the usual bolt 23. It will be noted the opening at is somewhatelongated so as to compensate for slight variations in the position ofthe lock.

The plate has formed on one side a short lateral flange 24. The flangeis made integral with the plate and coextensive lengthwise of the plateand preferably extends from the plate at an angle of slightly less than90. In positioning the plate l3 on the door the flange 24 is locatedsubstan- 5 tially flush with the edge of the door.

Another plate 30 is secured to the door jamb or frame H by a pluralityof flat-headed wood screws 3 i. This plate is of exactly the same lengthas the plate l3 and is provided coextensive with 0 its front edge withan integral turned over portion or lip, 32. As may be noted in Figs, 2and 3 this turned over portion is U-shaped in cross-section and extendsbeyond the outer edge of the door it! so as to embrace the flange 24.The outer edge of the lip 32 contacts the plate i3 when the door is inthe closed or locked position and the keeper 35 properly adjusted to thethickness of the door. A joint is thus made between the lip 32 and theplate [3 between which it is impossible to enter a jimmy or other pryingtool as a packing blade for contact with the bolt.

The plate has a depressed portion 33 in which the extension 3 1 of thekeeper 35 is accommodated. Thus a flush surface is maintained for 25 theentire length of the plate so as not to interfere with the opening orclosing of the door. This depressed portion 33 is provided with aplurality of spaced slots 36. The screws 37 securing the keeper in placepass through a pair or more of these slots. By providing a plurality ofslots, numerous diiferent arrangements of screws in difierent styles ofkeepers may be accommodated, both as to vertical and horizontalvariations. It 35 will be understood the bolt 23 engages the keeper 35when the door is in the locked position.

I claim:

1. A door interlocking device having in combination, an elongated plateof rigid construction, 40 means for securing said plate to a door, alock cooperating with said plate, a lateral flange formed integral withand coextensive with said plate, said flange extending outwardly fromsaid plate adjacent the edge of the door, a plate secured to the doorjamb at right angles to the door plate and being the same length as thedoor plate, a depressed portion at the central region of the door jambplate, a keeper, the extension of which is accommodated in saiddepressed portion, and a turned over lip formed on the door jamb platecoextensive with the length thereof, said lip completely embracing theflange on the door plate and having its outer edge contacting the doorplate when the door is in its closed position so as to form a jointwhich cannot be entered with a jimmy or other prying tool.

2. A door interlocking device having in combination, an elongated plateof rigid construction, means for securing said plate to a door, a lockcooperating with said plate, a lateral flange substantially coextensivewith said plate, a plate secured to the door jamb at right angles to thedoor plate and being the same length as the door plate, a depressedportion at the central region of the door jamb plate, a keeper, theextension of which is accommodated in said depressed portion, aplurality of horizontally disposed slots in said depressed portion toaccommodate difierent arrangements of screws in different styles ofkeepers, and a turned over lip formed on the door jamb plate coextensivewith the length thereof, said lip embracing the flange on the door platewhen the door is in its closed position so as to form a joint Whichcannot be entered with a jimmy or other prying tool JOSE MORA.

